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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1797

When the old man saw some litter on the ground, he quickly          .

A.picked it up B.picked up it C.picked them up D.picked up them.
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Whentheoldmansawsomelitteronth